25650840 has 64 divisors (see below), whose sum is σ = 78278400. Its totient is φ = 6722432.

The previous prime is 25650829. The next prime is 25650851. The reversal of 25650840 is 4805652.

It is an interprime number because it is at equal distance from previous prime (25650829) and next prime (25650851).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 25650798 and 25650807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5269 + ... + 8891.

It is an arithmetic number, because the mean of its divisors is an integer number (1223100).

Almost surely, 2^25650840 is an apocalyptic number.

25650840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25650840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39139200).

25650840 is an abundant number, since it is smaller than the sum of its proper divisors (52627560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25650840 is a wasteful number, since it uses less digits than its factorization.

25650840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3696 (or 3692 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 25650840 is about 5064.6658330042. The cubic root of 25650840 is about 294.9174910494.

The spelling of 25650840 in words is "twenty-five million, six hundred fifty thousand, eight hundred forty".